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Why is 4ft of unsaturated soil between the bottom of the installation and a limiting layer necessary?

April 26, 2017installation Limiting necessary soil unsaturated

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Why is 4ft of unsaturated soil between the bottom of the installation and a limiting layer necessary?

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According to the EPA, four foot of unsaturated soil is needed to properly remove pathogens and other pollutants from the wastewater before it reaches the groundwater. It is most critical for seepage pits and cesspools, since they are considered potential point-source pollution spots for groundwater contamination by the EPA.